114 lines
4.1 KiB
C#
114 lines
4.1 KiB
C#
using System;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using UnityEngine;
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namespace UnityEditor.ShaderGraph.Serialization
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{
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[Serializable]
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public class JsonObject : ISerializationCallbackReceiver
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{
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public virtual int latestVersion { get; } = 0;
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[SerializeField]
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protected int m_SGVersion = 0;
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public virtual int sgVersion { get => m_SGVersion; protected set => m_SGVersion = value; }
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internal protected delegate void VersionChange(int newVersion);
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internal protected VersionChange onBeforeVersionChange;
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internal protected Action onAfterVersionChange;
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internal void ChangeVersion(int newVersion)
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{
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if (newVersion == sgVersion)
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{
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return;
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}
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if (newVersion < 0)
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{
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Debug.LogError("Cant downgrade past version 0");
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return;
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}
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if (newVersion > latestVersion)
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{
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Debug.LogError("Cant upgrade to a version >= the current latest version");
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return;
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}
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onBeforeVersionChange?.Invoke(newVersion);
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sgVersion = newVersion;
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onAfterVersionChange?.Invoke();
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}
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public JsonObject()
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{
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sgVersion = latestVersion;
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}
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public static readonly string emptyObjectId = Guid.Empty.ToString("N");
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[SerializeField]
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string m_Type;
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[SerializeField]
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string m_ObjectId = Guid.NewGuid().ToString("N");
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internal void OverrideObjectId(string namespaceUid, string newObjectId) { m_ObjectId = GenerateNamespaceUUID(namespaceUid, newObjectId).ToString("N"); }
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internal void OverrideObjectId(string newObjectId) { m_ObjectId = newObjectId; }
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public string objectId => m_ObjectId;
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public bool objectIdIsEmpty => m_ObjectId.Equals(emptyObjectId);
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void ISerializationCallbackReceiver.OnBeforeSerialize()
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{
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m_Type = $"{GetType().FullName}";
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OnBeforeSerialize();
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}
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public virtual T CastTo<T>() where T : JsonObject { return (T)this; }
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public virtual string Serialize() { return EditorJsonUtility.ToJson(this, true); }
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public virtual void Deserailize(string typeInfo, string jsonData) { EditorJsonUtility.FromJsonOverwrite(jsonData, this); }
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public virtual void OnBeforeSerialize() { }
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public virtual void OnBeforeDeserialize() { }
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public virtual void OnAfterDeserialize() { }
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public virtual void OnAfterDeserialize(string json) { }
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public virtual void OnAfterMultiDeserialize(string json) { }
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internal static Guid GenerateNamespaceUUID(string Namespace, string Name)
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{
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Guid namespaceGuid;
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if (!Guid.TryParse(Namespace, out namespaceGuid))
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{
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// Fallback namespace in case the one provided is invalid.
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// If an object ID was used as the namespace, this shouldn't normally be reachable.
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namespaceGuid = new Guid("6ba7b812-9dad-11d1-80b4-00c04fd430c8");
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}
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return GenerateNamespaceUUID(namespaceGuid, Name);
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}
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internal static Guid GenerateNamespaceUUID(Guid Namespace, string Name)
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{
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// Generate a deterministic guid using namespace guids: RFC 4122 §4.3 version 5.
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void FlipByNetworkOrder(byte[] bytes)
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{ bytes = new byte[] { bytes[3], bytes[2], bytes[1], bytes[0], bytes[5], bytes[4], bytes[7], bytes[6] }; }
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var namespaceBytes = Namespace.ToByteArray();
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FlipByNetworkOrder(namespaceBytes);
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var nameBytes = Encoding.UTF8.GetBytes(Name);
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var hash = SHA1.Create().ComputeHash(namespaceBytes.Concat(nameBytes).ToArray());
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byte[] newguid = new byte[16];
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Array.Copy(hash, newguid, 16);
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newguid[6] = (byte)((newguid[6] & 0x0F) | 0x80);
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newguid[8] = (byte)((newguid[8] & 0x3F) | 0x80);
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FlipByNetworkOrder(newguid);
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return new Guid(newguid);
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}
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}
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}
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